Intergas Boiler pressure dropping

[NetihV]

Intergas Boiler (only 2 years old and serviced each year) pressure dropping to 0b after just 1hr of running - can anyone help? No leaks anywhere

 

[Deleted member 120897]

Check the pressure after running and see if it increases from say 1 bar to 3 bar, if this is the case (sound likely) then you might have a blocked communication hose from boiler to expansion vessel. That or your prv could be passing.